Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4344c9368dba06…

MALICIOUS

PDF

96.8 KB Created: 2021-09-20 02:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e84dc230a6eb0c77d557dac2abdf4dc SHA-1: 9033b484c208d8ff93936362d70f746ad6ad037f SHA-256: 1a4344c9368dba06527a1bd8dfcce39717339a74ddb1772c5f4f5de43ba43113
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits multiple indicators of malicious activity, including heuristic firings related to URI links and a high ML classification score. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent is to trick users into downloading a password-protected archive, likely containing a secondary payload. The presence of numerous external URLs, some pointing to compromised CMS uploads and disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=como+ocultar+iconos+de+aplicaciones+en+android PDF link annotation
    • https://allianztc.ro/files/file/43420198878.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/magumitozu.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/fetidijomag.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/58830150417.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/12697569865.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c30169415d209bac3fa5f95d41a398f/31416440707.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/remidivizi.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/1915783691.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/bikisegak.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/25627035049.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/12765377938.pdfPDF link annotation
    • https://prtl.pl/userfiles/file/77567361677.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/rafisajajefibe.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/lenejesewunodinoginimido.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/45155617275.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/51442244135.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/matokotisufa.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/vuwexasetudexaf.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/dovexagomulu.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/sunijabiruwapexakag.pdfIn PDF document text
    • http://araratmebel.ru/img/file/fonafadujolirafagam.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a85738baa---1347358408.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463ac69efc---58485598165.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102742086e---10328459795.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865b84ee7b---70245922990.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 10804 bytes
SHA-256: 1791b2d6d8ad73daed9469f6a09e9cbf6ae9fa3b7e00f3cbfe21932927cfb517
font_01_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 19608 bytes
SHA-256: 7079b8e8769ab2234819c56ef2e10ddc675b2a628dc6a0162b4c00ed89e1ba56
font_02_sfnt_off00015ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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